Walliserodus curvatus ( Branson and Branson, 1947 )

Waid, Christopher B. T. & Cramer, Bradley D., 2017, Telychian (Llandovery, Silurian) conodonts from the LaPorte City Formation of eastern Iowa, USA (East-Central Iowa Basin) and their implications for global Telychian conodont biostratigraphic correlation, Palaeontologia Electronica 42 (6), pp. 1-37 : 21

Walliserodus curvatus ( Branson and Branson, 1947)

Figure 7.12 -13

*1947 Acodus curvatus ; Branson and Branson, pl. 82, figs. 9-10, 41, 43.

2002 Walliserodus curvatus Branson and Branson ; Won, Blodgett, and Nestor, fig. 7.19-7.21.

2002 Walliserodus curvatus Branson and Branson ; Zhang and Barnes, fig. 17.1-17.20, 17.23, 17.24 (multielement; synonymy through 1995).

2003 Walliserodus curvatus Branson and Branson ; Pyle and Barnes, fig. 18.2-18.4.

2007a Walliserodus curvatus Branson and Branson ; Zhang and Barnes, fig. 8.34-8.38 (multielement).

2007b Walliserodus curvatus Branson and Branson ; Zhang and Barnes, fig. 11.1-11.2.

2011 Walliserodus curvatus Branson and Branson ; Zhang, fig. 17.1-17.4.

2014 Walliserodus curvatus Branson and Branson ; Zhang and Pell, fig. 6.7.

2015 Walliserodus curvatus Branson and Branson ; Männik, Loydell, Nestor, and Nõlvak, fig. 8J-K, P.

Description. Elements are coniform with a very large base relative to element size. The walls of basal cavities are thin, except at corners. Curvatiform elements are sharply curved and have weakly developed or no costae. Basal cavity of curvatiform element slightly laterally compressed, giving a pointed oval shape in cross section. Multicostatiform elements have slightly to strongly laterally compressed basal cavities with oval to slightly triangular shaped basal cavities. Several costae extend from corners of the basal cavity to the white matter of the cusp, extending past the point of maximum curvature. Dyscritiform element sharply curved, with a basal cavity that is a symmetrical triangle in cross section. Unicostatiform elements are less sharply curved than the other elements, and have weakly developed costae extending along the outer side of the element.

Material examined. Five dyscritiform, six curvatiform, four unicostatiform, and five multicostatiform elements.

Figures

FIGURE 7. Simple cone elements from Garrison Core. All specimens in lateral view except for 6. 1-2, Panderodus equicostatus, graciliform, GC 124.66–124.93 m, SUI 142251 (1) and graciliform, GC 121.92-121.88 m, SUI 142253 (2). 3-5, Panderodus panderi, graciliform, GC 124.66–124.93 m, SUI 142252 (3); arcuatiform, GC 131.95–132.23 m, SUI 142254 (4); and graciliform, GC 111.38–111.63 m, SUI 142255 (5). 6, Psuedooneotodus beckmanni, oral view, GC 135.65–136.10 m, SUI 142256. 7, Panderodus cf. P. unicostatus, falciform, GC 135.65–136.10 m, SUI 142257. 8- 11, Panderodus unicostatus, falciform, GC 131.95–132.23 m, SUI 142258 (8); fused cluster of 8 elements, GC 130.20–130.48 m, specimen destroyed processing for SEM (9); fused cluster of 6 elements, GC 131.95–132.23 m, SUI 142260 (10); and tortiform element, GC 131.95–132.23 m, SUI 142261 (11); 12-13, Walliserodus curvatus, dyscritiform, GC 134.06–134.31 m, SUI 142262 (12) and curvatiform, GC 128.85–129.11 m, SUI 142263 (13). 14-15, Panderodus greenlandensis, arcuatiform GC 118.20–118.41 m, SUI 142264 (14) and graciliform, GC 134.06–134.31 m, SUI 142265 (15). White scale bar represents 0.5 mm.